I read of this airbox mod on the 500 forum http://speeding.to/ex500
I did it myself and it definately gave smoother performance in the lower RPM's. Something about equalizing the pressure in the airbox.
Yeah I was kind of hesitant myself but figured I could glue a disk of plastic or something on the hole if it F'd up my bike. I don't really notice it affecting my midrange although there is a sometimes a lag between 4.5 and 6 depending on the weather.
But in the lower range it was kind of jerky before I did this, I have much better throttle control after the hole was drilled. I will recommend this with no problem on an otherwise stock bike. Took 10 minutes.
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